LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR MANUFATURING THE SAME

• US 20130162570A1
• Filed: 12/20/2012
• Published: 06/27/2013
• Est. Priority Date: 12/22/2011
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Shin, HeeSun, Lee, SeokWoo, Yu, JaeSung, Kim, JuHan, Lee, SanJung, Song, InHyuk
• Granted Patent: US 9,759,940 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

Disclosed is an LCD device which realizes decreased thickness, simplified process, and decreased cost by using a common electrode for formation of electric field to drive liquid crystal as a sensing electrode, and removing a touch screen from an upper surface of the liquid crystal panel, the LCD device comprising gate and data lines crossing each other to define plural pixels on a lower substrate; a pixel electrode in each of the plural pixels; plural common electrode blocks patterned at the different layer from the pixel electrode, wherein the common electrode blocks, together with the pixel electrode, forms an electric field, and senses a user'"'"'s touch; and plural sensing lines electrically connected with the common electrode blocks, wherein, if the sensing line is electrically connected with one of the common electrode blocks, the sensing line is insulated from the remaining common electrode blocks.

Claims

1. An LCD device comprising:

gate and data lines crossing each other to define a plurality of pixels on a lower substrate;

a pixel electrode in each of the plurality of pixels;

plural common electrode blocks patterned at the different layer from the pixel electrode, wherein the common electrode blocks, together with the pixel electrode, forms an electric field, and senses a user'"'"'s touch; and

plural sensing lines electrically connected with the common electrode blocks,

wherein, if the sensing line is electrically connected with one of the common electrode blocks, the sensing line is insulated from the remaining common electrode blocks.

2. The LCD device according to claim 1, wherein the plural common electrode blocks are disposed on the pixel electrode under the condition that a second passivation layer is interposed between the common electrode block and the pixel electrode, and the common electrode block is provided with at least one slit therein.

3. The LCD device according to claim 1, wherein the pixel electrode is disposed on the common electrode block under the condition that a second passivation layer is interposed between the common electrode block and the pixel electrode, and the pixel electrode is provided with at least one slit therein.

4. The LCD device according to claim 1, wherein the sensing line is disposed on the gate line or data line while being overlapped with the gate line or data line.

5. The LCD device according to claim 1, wherein the sensing line is disposed in a direction parallel to the gate line or data line.

6. The LCD device according to claim 1, wherein the sensing line and the pixel electrode are disposed at the same layer.

7. The LCD device according to claim 1, wherein a common electrode contact hole for electrically connecting the sensing line and the common electrode block with each other is in a non-transmission area so as to prevent an aperture ratio from being lowered.

8. The LCD device according to claim 1, wherein an end of the sensing line is connected with a multiplexer (MUX).

9. The LCD device according to claim 8, wherein the multiplexer (MUX) is disposed on the lower substrate with the sensing line, is provided inside a drive IC, or is disposed as an additional multiplexer chip.

10. The LCD device according to claim 1, wherein the sensing line is disposed on the pixel electrode while being in contact with the pixel electrode.

11. The LCD device according to claim 10, wherein the sensing line and the pixel electrode are formed by the use of halftone mask.

12. The LCD device according to 1, further comprising a high-resistance conductive layer on a rear surface of the upper substrate bonded to the lower substrate, the high-resistance conductive layer for making static electricity flow into a ground electrode.

13. An LCD Device comprising:

an active area of a lower substrate including gate and data lines crossing each other to define a plurality of pixels;

a transistor in each of the pixels;

a pixel electrode in each of the pixels;

plural common electrode blocks formed at the different layer from the pixel electrode, wherein the common electrode blocks, together with the pixel electrode, forms an electric field, and senses a user'"'"'s touch; and

plural sensing lines electrically connected with the common electrode blocks;

a dummy area along the edge of the active area; and

a blocking layer on a semiconductor layer of the transistor formed in the active area and the dummy area, the blocking layer for blocking ultraviolet rays,

wherein, if the sensing line is electrically connected with one of the common electrode blocks, the sensing line is insulated from the remaining common electrode blocks.

14. The LCD device according to claim 13, wherein the blocking layer is formed of the same material as that of the sensing line, and is formed during a process for forming the sensing line.

15. The LCD device according to claim 13, wherein the transistor of the dummy area includes a transistor on a Gate-In-Panel (GIP) structure where a gate driving circuit is provided inside a panel, a transistor on an ESD structure for an electrostatic discharge, a transistor of an auto probe for a lighting test, and a transistor for an engineer test.

16. A method for manufacturing an LCD device comprising:

sequentially forming a gate electrode, a gate insulating film, a semiconductor layer, a source electrode, a drain electrode, and a first passivation layer on a lower substrate;

forming a pixel electrode after forming a pixel electrode contact hole in the first passivation layer, and electrically connecting the pixel electrode and the drain electrode with each other through the pixel electrode contact hole;

forming plural sensing lines in a predetermined direction, wherein the sensing line is formed on the first passivation layer, and is provided at a predetermined interval from the pixel electrode;

forming a second passivation layer on the pixel electrode and the sensing line, and forming a common electrode contact hole so as to make the sensing line connected with one of plural common electrode blocks, and simultaneously make the sensing line insulated from the remaining common electrode blocks; and

forming the common electrode block on the second passivation layer so as to electrically connect the sensing line and the common electrode block with each other.

17. The method according to claim 16, wherein the sensing line is formed on the pixel electrode while being in contact with the pixel electrode by the use of halftone mask.

18. The method according to claim 16, wherein a blocking layer for blocking ultraviolet rays is formed on the semiconductor layer.